Method and apparatus for link adaptation in precoded MIMO systems

a technology of mimo and link adaptation, applied in the field of link adaptation, can solve the problems of delay in the estimation process, inability to adapt, and variable channel fading
US20150110013A1Inactive Publication Date: 2015-04-23NEC (CHINA) CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NEC (CHINA) CO LTD
Publication Date
2015-04-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

Embodiments of the invention relate to methods and apparatus for link adaptation in a preceded MIMO system. According to one embodiment, there is provided a method for link adaptation in a precoded MIMO system. The method comprises: receiving first channel quality information γCQI; with respect to at least one layer r in a plurality of layers in a link; obtaining a Hybrid Automatic Repeat Request (HARQ) scaling factor μr that is associated with a HARQ feedback; and interpreting the first channel quality information γCQI into second channel quality information {circumflex over (γ)}r based on at least the HARQ scaling factor μr, wherein the second channel quality information {circumflex over (γ)}r is for adapting the at least one layer r in the plurality of layers. According to another embodiment, there is provided an apparatus for link adaptation in a precoded MIMO system.
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Description

FIELD OF THE INVENTION

[0001] Embodiments of the present invention generally relate to link adaptation. More particularly, embodiments of the present invention relate to methods and apparatuses for link adaptation in a precoded multiple-input multiple-output (MIMO) system.BACKGROUND OF THE INVENTION

[0002] In the technical field of wireless communication, channel fading is a fundamental characteristic of a wireless communication channel. Meanwhile, channel fading may be variable over time of the instantaneous conditions of the wireless communication channel. Channel-dependent adaptation of a transmission is one way to handle channel fading. When a channel is in a good state, it is possible to transmit data using a low level of error protection on the channel. In contrast, when the channel is in a bad fading state, a higher level of error protection is necessary, which causes a reduction in the information data rate. The level of error protection may, for example, be varied by changing t...

Claims

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